[LYN-4938] Prism: Paths in Engine settings page do not use consistent slashes (#1721)

* Corrected focus for form line edit widgets.
* Consistent slash usage for folder browse edit widgets.

Signed-off-by: Benjamin Jillich <jillich@amazon.com>

Code/Tools/ProjectManager/Source/FormFolderBrowseEditWidget.h

@@ -22,6 +22,8 @@ namespace O3DE::ProjectManager
         explicit FormFolderBrowseEditWidget(const QString& labelText, const QString& valueText = "", QWidget* parent = nullptr);
         ~FormFolderBrowseEditWidget() = default;
 
+        void setText(const QString& text) override;
+
     protected:
         void HandleBrowseButton() override;
     };